fix: don't fail release on assignee errors (#81)

GitHub App installation tokens cannot assign bots/apps via the REST
`addAssignees` endpoint — the call rejects with "Assigning agents is
not supported with GitHub App installation tokens." When a `Version`
workflow runs under an app-issued token and the actor is itself a bot
(e.g. `exodus-neo[bot]`), the assignee defaults to that bot and the
whole release fails — even though the PR is otherwise created.

Wrap `addAssignees` in `.catch(core.warning)` to match the precedent
already in place for `requestReviewers` (#80) and `enablePullRequestAutoMerge`.
PR adornment is best-effort and shouldn't fail the release.

Co-authored-by: exodus-neo <exodus-neo@users.noreply.github.com>
Co-authored-by: Mark <exo-mv@users.noreply.github.com>

Author: 3 people

dist/publish/index.js

@@ -69,11 +69,17 @@ export async function createPullRequest({
 
   if (assignees) {
     promises.push(
-      client.rest.issues.addAssignees({
-        ...repo,
-        issue_number: response.data.number,
-        assignees,
-      })
+      client.rest.issues
+        .addAssignees({
+          ...repo,
+          issue_number: response.data.number,
+          assignees,
+        })
+        .catch((error) => {
+          core.warning(
+            `Failed to assign users: ${unwrapErrorMessage(error, 'for unknown reasons')}`
+          )
+        })
     )
   }